| | 1 | // SPDX-License-Identifier: GPL-2.0 |
| | 2 | /* |
| | 3 | * |
| | 4 | * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. |
| | 5 | * |
| | 6 | */ |
| | 7 | |
| | 8 | #include <linux/buffer_head.h> |
| | 9 | #include <linux/fs.h> |
| | 10 | #include <linux/mpage.h> |
| | 11 | #include <linux/namei.h> |
| | 12 | #include <linux/nls.h> |
| | 13 | #include <linux/uio.h> |
| | 14 | #include <linux/writeback.h> |
| | 15 | |
| | 16 | #include "debug.h" |
| | 17 | #include "ntfs.h" |
| | 18 | #include "ntfs_fs.h" |
| | 19 | |
| | 20 | /* |
| | 21 | * ntfs_read_mft - Read record and parse MFT. |
| | 22 | */ |
| | 23 | static struct inode *ntfs_read_mft(struct inode *inode, |
| | 24 | const struct cpu_str *name, |
| | 25 | const struct MFT_REF *ref) |
| | 26 | { |
| | 27 | int err = 0; |
| | 28 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 29 | struct super_block *sb = inode->i_sb; |
| | 30 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
| | 31 | mode_t mode = 0; |
| | 32 | struct ATTR_STD_INFO5 *std5 = NULL; |
| | 33 | struct ATTR_LIST_ENTRY *le; |
| | 34 | struct ATTRIB *attr; |
| | 35 | bool is_match = false; |
| | 36 | bool is_root = false; |
| | 37 | bool is_dir; |
| | 38 | unsigned long ino = inode->i_ino; |
| | 39 | u32 rp_fa = 0, asize, t32; |
| | 40 | u16 roff, rsize, names = 0, links = 0; |
| | 41 | const struct ATTR_FILE_NAME *fname = NULL; |
| | 42 | const struct INDEX_ROOT *root; |
| | 43 | struct REPARSE_DATA_BUFFER rp; // 0x18 bytes |
| | 44 | u64 t64; |
| | 45 | struct MFT_REC *rec; |
| | 46 | struct runs_tree *run; |
| | 47 | struct timespec64 ts; |
| | 48 | |
| | 49 | inode->i_op = NULL; |
| | 50 | /* Setup 'uid' and 'gid' */ |
| | 51 | inode->i_uid = sbi->options->fs_uid; |
| | 52 | inode->i_gid = sbi->options->fs_gid; |
| | 53 | |
| | 54 | err = mi_init(&ni->mi, sbi, ino); |
| | 55 | if (err) |
| | 56 | goto out; |
| | 57 | |
| | 58 | if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { |
| | 59 | t64 = sbi->mft.lbo >> sbi->cluster_bits; |
| | 60 | t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); |
| | 61 | sbi->mft.ni = ni; |
| | 62 | init_rwsem(&ni->file.run_lock); |
| | 63 | |
| | 64 | if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { |
| | 65 | err = -ENOMEM; |
| | 66 | goto out; |
| | 67 | } |
| | 68 | } |
| | 69 | |
| | 70 | err = mi_read(&ni->mi, ino == MFT_REC_MFT); |
| | 71 | |
| | 72 | if (err) |
| | 73 | goto out; |
| | 74 | |
| | 75 | rec = ni->mi.mrec; |
| | 76 | |
| | 77 | if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { |
| | 78 | ; |
| | 79 | } else if (ref->seq != rec->seq) { |
| | 80 | err = -EINVAL; |
| | 81 | ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, |
| | 82 | le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); |
| | 83 | goto out; |
| | 84 | } else if (!is_rec_inuse(rec)) { |
| | 85 | err = -ESTALE; |
| | 86 | ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); |
| | 87 | goto out; |
| | 88 | } |
| | 89 | |
| | 90 | if (le32_to_cpu(rec->total) != sbi->record_size) { |
| | 91 | /* Bad inode? */ |
| | 92 | err = -EINVAL; |
| | 93 | goto out; |
| | 94 | } |
| | 95 | |
| | 96 | if (!is_rec_base(rec)) { |
| | 97 | err = -EINVAL; |
| | 98 | goto out; |
| | 99 | } |
| | 100 | |
| | 101 | /* Record should contain $I30 root. */ |
| | 102 | is_dir = rec->flags & RECORD_FLAG_DIR; |
| | 103 | |
| | 104 | /* MFT_REC_MFT is not a dir */ |
| | 105 | if (is_dir && ino == MFT_REC_MFT) { |
| | 106 | err = -EINVAL; |
| | 107 | goto out; |
| | 108 | } |
| | 109 | |
| | 110 | inode->i_generation = le16_to_cpu(rec->seq); |
| | 111 | |
| | 112 | /* Enumerate all struct Attributes MFT. */ |
| | 113 | le = NULL; |
| | 114 | attr = NULL; |
| | 115 | |
| | 116 | /* |
| | 117 | * To reduce tab pressure use goto instead of |
| | 118 | * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) |
| | 119 | */ |
| | 120 | next_attr: |
| | 121 | run = NULL; |
| | 122 | err = -EINVAL; |
| | 123 | attr = ni_enum_attr_ex(ni, attr, &le, NULL); |
| | 124 | if (!attr) |
| | 125 | goto end_enum; |
| | 126 | |
| | 127 | if (le && le->vcn) { |
| | 128 | /* This is non primary attribute segment. Ignore if not MFT. */ |
| | 129 | if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) |
| | 130 | goto next_attr; |
| | 131 | |
| | 132 | run = &ni->file.run; |
| | 133 | asize = le32_to_cpu(attr->size); |
| | 134 | goto attr_unpack_run; |
| | 135 | } |
| | 136 | |
| | 137 | roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); |
| | 138 | rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); |
| | 139 | asize = le32_to_cpu(attr->size); |
| | 140 | |
| | 141 | /* |
| | 142 | * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'. |
| | 143 | * There not critical to check this case again |
| | 144 | */ |
| | 145 | if (attr->name_len && |
| | 146 | sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) > |
| | 147 | asize) |
| | 148 | goto out; |
| | 149 | |
| | 150 | if (attr->non_res) { |
| | 151 | t64 = le64_to_cpu(attr->nres.alloc_size); |
| | 152 | if (le64_to_cpu(attr->nres.data_size) > t64 || |
| | 153 | le64_to_cpu(attr->nres.valid_size) > t64) |
| | 154 | goto out; |
| | 155 | } |
| | 156 | |
| | 157 | switch (attr->type) { |
| | 158 | case ATTR_STD: |
| | 159 | if (attr->non_res || |
| | 160 | asize < sizeof(struct ATTR_STD_INFO) + roff || |
| | 161 | rsize < sizeof(struct ATTR_STD_INFO)) |
| | 162 | goto out; |
| | 163 | |
| | 164 | if (std5) |
| | 165 | goto next_attr; |
| | 166 | |
| | 167 | std5 = Add2Ptr(attr, roff); |
| | 168 | |
| | 169 | #ifdef STATX_BTIME |
| | 170 | nt2kernel(std5->cr_time, &ni->i_crtime); |
| | 171 | #endif |
| | 172 | nt2kernel(std5->a_time, &ts); |
| | 173 | inode_set_atime_to_ts(inode, ts); |
| | 174 | nt2kernel(std5->c_time, &ts); |
| | 175 | inode_set_ctime_to_ts(inode, ts); |
| | 176 | nt2kernel(std5->m_time, &ts); |
| | 177 | inode_set_mtime_to_ts(inode, ts); |
| | 178 | |
| | 179 | ni->std_fa = std5->fa; |
| | 180 | |
| | 181 | if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && |
| | 182 | rsize >= sizeof(struct ATTR_STD_INFO5)) |
| | 183 | ni->std_security_id = std5->security_id; |
| | 184 | goto next_attr; |
| | 185 | |
| | 186 | case ATTR_LIST: |
| | 187 | if (attr->name_len || le || ino == MFT_REC_LOG) |
| | 188 | goto out; |
| | 189 | |
| | 190 | err = ntfs_load_attr_list(ni, attr); |
| | 191 | if (err) |
| | 192 | goto out; |
| | 193 | |
| | 194 | le = NULL; |
| | 195 | attr = NULL; |
| | 196 | goto next_attr; |
| | 197 | |
| | 198 | case ATTR_NAME: |
| | 199 | if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || |
| | 200 | rsize < SIZEOF_ATTRIBUTE_FILENAME) |
| | 201 | goto out; |
| | 202 | |
| | 203 | names += 1; |
| | 204 | fname = Add2Ptr(attr, roff); |
| | 205 | if (fname->type == FILE_NAME_DOS) |
| | 206 | goto next_attr; |
| | 207 | |
| | 208 | links += 1; |
| | 209 | if (name && name->len == fname->name_len && |
| | 210 | !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, |
| | 211 | NULL, false)) |
| | 212 | is_match = true; |
| | 213 | |
| | 214 | goto next_attr; |
| | 215 | |
| | 216 | case ATTR_DATA: |
| | 217 | if (is_dir) { |
| | 218 | /* Ignore data attribute in dir record. */ |
| | 219 | goto next_attr; |
| | 220 | } |
| | 221 | |
| | 222 | if (ino == MFT_REC_BADCLUST && !attr->non_res) |
| | 223 | goto next_attr; |
| | 224 | |
| | 225 | if (attr->name_len && |
| | 226 | ((ino != MFT_REC_BADCLUST || !attr->non_res || |
| | 227 | attr->name_len != ARRAY_SIZE(BAD_NAME) || |
| | 228 | memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && |
| | 229 | (ino != MFT_REC_SECURE || !attr->non_res || |
| | 230 | attr->name_len != ARRAY_SIZE(SDS_NAME) || |
| | 231 | memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { |
| | 232 | /* File contains stream attribute. Ignore it. */ |
| | 233 | goto next_attr; |
| | 234 | } |
| | 235 | |
| | 236 | if (is_attr_sparsed(attr)) |
| | 237 | ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; |
| | 238 | else |
| | 239 | ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; |
| | 240 | |
| | 241 | if (is_attr_compressed(attr)) |
| | 242 | ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; |
| | 243 | else |
| | 244 | ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; |
| | 245 | |
| | 246 | if (is_attr_encrypted(attr)) |
| | 247 | ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; |
| | 248 | else |
| | 249 | ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; |
| | 250 | |
| | 251 | if (!attr->non_res) { |
| | 252 | ni->i_valid = inode->i_size = rsize; |
| | 253 | inode_set_bytes(inode, rsize); |
| | 254 | } |
| | 255 | |
| | 256 | mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); |
| | 257 | |
| | 258 | if (!attr->non_res) { |
| | 259 | ni->ni_flags |= NI_FLAG_RESIDENT; |
| | 260 | goto next_attr; |
| | 261 | } |
| | 262 | |
| | 263 | inode_set_bytes(inode, attr_ondisk_size(attr)); |
| | 264 | |
| | 265 | ni->i_valid = le64_to_cpu(attr->nres.valid_size); |
| | 266 | inode->i_size = le64_to_cpu(attr->nres.data_size); |
| | 267 | if (!attr->nres.alloc_size) |
| | 268 | goto next_attr; |
| | 269 | |
| | 270 | run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : |
| | 271 | &ni->file.run; |
| | 272 | break; |
| | 273 | |
| | 274 | case ATTR_ROOT: |
| | 275 | if (attr->non_res) |
| | 276 | goto out; |
| | 277 | |
| | 278 | root = Add2Ptr(attr, roff); |
| | 279 | |
| | 280 | if (attr->name_len != ARRAY_SIZE(I30_NAME) || |
| | 281 | memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) |
| | 282 | goto next_attr; |
| | 283 | |
| | 284 | if (root->type != ATTR_NAME || |
| | 285 | root->rule != NTFS_COLLATION_TYPE_FILENAME) |
| | 286 | goto out; |
| | 287 | |
| | 288 | if (!is_dir) |
| | 289 | goto next_attr; |
| | 290 | |
| | 291 | is_root = true; |
| | 292 | ni->ni_flags |= NI_FLAG_DIR; |
| | 293 | |
| | 294 | err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); |
| | 295 | if (err) |
| | 296 | goto out; |
| | 297 | |
| | 298 | mode = sb->s_root ? |
| | 299 | (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : |
| | 300 | (S_IFDIR | 0777); |
| | 301 | goto next_attr; |
| | 302 | |
| | 303 | case ATTR_ALLOC: |
| | 304 | if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || |
| | 305 | memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) |
| | 306 | goto next_attr; |
| | 307 | |
| | 308 | inode->i_size = le64_to_cpu(attr->nres.data_size); |
| | 309 | ni->i_valid = le64_to_cpu(attr->nres.valid_size); |
| | 310 | inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); |
| | 311 | |
| | 312 | run = &ni->dir.alloc_run; |
| | 313 | break; |
| | 314 | |
| | 315 | case ATTR_BITMAP: |
| | 316 | if (ino == MFT_REC_MFT) { |
| | 317 | if (!attr->non_res) |
| | 318 | goto out; |
| | 319 | #ifndef CONFIG_NTFS3_64BIT_CLUSTER |
| | 320 | /* 0x20000000 = 2^32 / 8 */ |
| | 321 | if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) |
| | 322 | goto out; |
| | 323 | #endif |
| | 324 | run = &sbi->mft.bitmap.run; |
| | 325 | break; |
| | 326 | } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && |
| | 327 | !memcmp(attr_name(attr), I30_NAME, |
| | 328 | sizeof(I30_NAME)) && |
| | 329 | attr->non_res) { |
| | 330 | run = &ni->dir.bitmap_run; |
| | 331 | break; |
| | 332 | } |
| | 333 | goto next_attr; |
| | 334 | |
| | 335 | case ATTR_REPARSE: |
| | 336 | if (attr->name_len) |
| | 337 | goto next_attr; |
| | 338 | |
| | 339 | rp_fa = ni_parse_reparse(ni, attr, &rp); |
| | 340 | switch (rp_fa) { |
| | 341 | case REPARSE_LINK: |
| | 342 | /* |
| | 343 | * Normal symlink. |
| | 344 | * Assume one unicode symbol == one utf8. |
| | 345 | */ |
| | 346 | inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer |
| | 347 | .PrintNameLength) / |
| | 348 | sizeof(u16); |
| | 349 | ni->i_valid = inode->i_size; |
| | 350 | /* Clear directory bit. */ |
| | 351 | if (ni->ni_flags & NI_FLAG_DIR) { |
| | 352 | indx_clear(&ni->dir); |
| | 353 | memset(&ni->dir, 0, sizeof(ni->dir)); |
| | 354 | ni->ni_flags &= ~NI_FLAG_DIR; |
| | 355 | } else { |
| | 356 | run_close(&ni->file.run); |
| | 357 | } |
| | 358 | mode = S_IFLNK | 0777; |
| | 359 | is_dir = false; |
| | 360 | if (attr->non_res) { |
| | 361 | run = &ni->file.run; |
| | 362 | goto attr_unpack_run; // Double break. |
| | 363 | } |
| | 364 | break; |
| | 365 | |
| | 366 | case REPARSE_COMPRESSED: |
| | 367 | break; |
| | 368 | |
| | 369 | case REPARSE_DEDUPLICATED: |
| | 370 | break; |
| | 371 | } |
| | 372 | goto next_attr; |
| | 373 | |
| | 374 | case ATTR_EA_INFO: |
| | 375 | if (!attr->name_len && |
| | 376 | resident_data_ex(attr, sizeof(struct EA_INFO))) { |
| | 377 | ni->ni_flags |= NI_FLAG_EA; |
| | 378 | /* |
| | 379 | * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode |
| | 380 | */ |
| | 381 | inode->i_mode = mode; |
| | 382 | ntfs_get_wsl_perm(inode); |
| | 383 | mode = inode->i_mode; |
| | 384 | } |
| | 385 | goto next_attr; |
| | 386 | |
| | 387 | default: |
| | 388 | goto next_attr; |
| | 389 | } |
| | 390 | |
| | 391 | attr_unpack_run: |
| | 392 | roff = le16_to_cpu(attr->nres.run_off); |
| | 393 | |
| | 394 | if (roff > asize) { |
| | 395 | err = -EINVAL; |
| | 396 | goto out; |
| | 397 | } |
| | 398 | |
| | 399 | t64 = le64_to_cpu(attr->nres.svcn); |
| | 400 | |
| | 401 | err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), |
| | 402 | t64, Add2Ptr(attr, roff), asize - roff); |
| | 403 | if (err < 0) |
| | 404 | goto out; |
| | 405 | err = 0; |
| | 406 | goto next_attr; |
| | 407 | |
| | 408 | end_enum: |
| | 409 | |
| | 410 | if (!std5) |
| | 411 | goto out; |
| | 412 | |
| | 413 | if (!is_match && name) { |
| | 414 | err = -ENOENT; |
| | 415 | goto out; |
| | 416 | } |
| | 417 | |
| | 418 | if (std5->fa & FILE_ATTRIBUTE_READONLY) |
| | 419 | mode &= ~0222; |
| | 420 | |
| | 421 | if (!names) { |
| | 422 | err = -EINVAL; |
| | 423 | goto out; |
| | 424 | } |
| | 425 | |
| | 426 | if (names != le16_to_cpu(rec->hard_links)) { |
| | 427 | /* Correct minor error on the fly. Do not mark inode as dirty. */ |
| | 428 | ntfs_inode_warn(inode, "Correct links count -> %u.", names); |
| | 429 | rec->hard_links = cpu_to_le16(names); |
| | 430 | ni->mi.dirty = true; |
| | 431 | } |
| | 432 | |
| | 433 | set_nlink(inode, links); |
| | 434 | |
| | 435 | if (S_ISDIR(mode)) { |
| | 436 | ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; |
| | 437 | |
| | 438 | /* |
| | 439 | * Dot and dot-dot should be included in count but was not |
| | 440 | * included in enumeration. |
| | 441 | * Usually a hard links to directories are disabled. |
| | 442 | */ |
| | 443 | inode->i_op = &ntfs_dir_inode_operations; |
| | 444 | inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? |
| | 445 | &ntfs_legacy_dir_operations : |
| | 446 | &ntfs_dir_operations; |
| | 447 | ni->i_valid = 0; |
| | 448 | } else if (S_ISLNK(mode)) { |
| | 449 | ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; |
| | 450 | inode->i_op = &ntfs_link_inode_operations; |
| | 451 | inode->i_fop = NULL; |
| | 452 | inode_nohighmem(inode); |
| | 453 | } else if (S_ISREG(mode)) { |
| | 454 | ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; |
| | 455 | inode->i_op = &ntfs_file_inode_operations; |
| | 456 | inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? |
| | 457 | &ntfs_legacy_file_operations : |
| | 458 | &ntfs_file_operations; |
| | 459 | inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : |
| | 460 | &ntfs_aops; |
| | 461 | if (ino != MFT_REC_MFT) |
| | 462 | init_rwsem(&ni->file.run_lock); |
| | 463 | } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || |
| | 464 | S_ISSOCK(mode)) { |
| | 465 | inode->i_op = &ntfs_special_inode_operations; |
| | 466 | init_special_inode(inode, mode, inode->i_rdev); |
| | 467 | } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && |
| | 468 | fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { |
| | 469 | /* Records in $Extend are not a files or general directories. */ |
| | 470 | inode->i_op = &ntfs_file_inode_operations; |
| | 471 | } else { |
| | 472 | err = -EINVAL; |
| | 473 | goto out; |
| | 474 | } |
| | 475 | |
| | 476 | if ((sbi->options->sys_immutable && |
| | 477 | (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && |
| | 478 | !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { |
| | 479 | inode->i_flags |= S_IMMUTABLE; |
| | 480 | } else { |
| | 481 | inode->i_flags &= ~S_IMMUTABLE; |
| | 482 | } |
| | 483 | |
| | 484 | inode->i_mode = mode; |
| | 485 | if (!(ni->ni_flags & NI_FLAG_EA)) { |
| | 486 | /* If no xattr then no security (stored in xattr). */ |
| | 487 | inode->i_flags |= S_NOSEC; |
| | 488 | } |
| | 489 | |
| | 490 | if (ino == MFT_REC_MFT && !sb->s_root) |
| | 491 | sbi->mft.ni = NULL; |
| | 492 | |
| | 493 | unlock_new_inode(inode); |
| | 494 | |
| | 495 | return inode; |
| | 496 | |
| | 497 | out: |
| | 498 | if (ino == MFT_REC_MFT && !sb->s_root) |
| | 499 | sbi->mft.ni = NULL; |
| | 500 | |
| | 501 | iget_failed(inode); |
| | 502 | return ERR_PTR(err); |
| | 503 | } |
| | 504 | |
| | 505 | /* |
| | 506 | * ntfs_test_inode |
| | 507 | * |
| | 508 | * Return: 1 if match. |
| | 509 | */ |
| | 510 | static int ntfs_test_inode(struct inode *inode, void *data) |
| | 511 | { |
| | 512 | struct MFT_REF *ref = data; |
| | 513 | |
| | 514 | return ino_get(ref) == inode->i_ino; |
| | 515 | } |
| | 516 | |
| | 517 | static int ntfs_set_inode(struct inode *inode, void *data) |
| | 518 | { |
| | 519 | const struct MFT_REF *ref = data; |
| | 520 | |
| | 521 | inode->i_ino = ino_get(ref); |
| | 522 | return 0; |
| | 523 | } |
| | 524 | |
| | 525 | struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, |
| | 526 | const struct cpu_str *name) |
| | 527 | { |
| | 528 | struct inode *inode; |
| | 529 | |
| | 530 | inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, |
| | 531 | (void *)ref); |
| | 532 | if (unlikely(!inode)) |
| | 533 | return ERR_PTR(-ENOMEM); |
| | 534 | |
| | 535 | /* If this is a freshly allocated inode, need to read it now. */ |
| | 536 | if (inode->i_state & I_NEW) |
| | 537 | inode = ntfs_read_mft(inode, name, ref); |
| | 538 | else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { |
| | 539 | /* Inode overlaps? */ |
| | 540 | _ntfs_bad_inode(inode); |
| | 541 | } |
| | 542 | |
| | 543 | if (IS_ERR(inode) && name) |
| | 544 | ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); |
| | 545 | |
| | 546 | return inode; |
| | 547 | } |
| | 548 | |
| | 549 | enum get_block_ctx { |
| | 550 | GET_BLOCK_GENERAL = 0, |
| | 551 | GET_BLOCK_WRITE_BEGIN = 1, |
| | 552 | GET_BLOCK_DIRECT_IO_R = 2, |
| | 553 | GET_BLOCK_DIRECT_IO_W = 3, |
| | 554 | GET_BLOCK_BMAP = 4, |
| | 555 | }; |
| | 556 | |
| | 557 | static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, |
| | 558 | struct buffer_head *bh, int create, |
| | 559 | enum get_block_ctx ctx) |
| | 560 | { |
| | 561 | struct super_block *sb = inode->i_sb; |
| | 562 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
| | 563 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 564 | struct folio *folio = bh->b_folio; |
| | 565 | u8 cluster_bits = sbi->cluster_bits; |
| | 566 | u32 block_size = sb->s_blocksize; |
| | 567 | u64 bytes, lbo, valid; |
| | 568 | u32 off; |
| | 569 | int err; |
| | 570 | CLST vcn, lcn, len; |
| | 571 | bool new; |
| | 572 | |
| | 573 | /* Clear previous state. */ |
| | 574 | clear_buffer_new(bh); |
| | 575 | clear_buffer_uptodate(bh); |
| | 576 | |
| | 577 | if (is_resident(ni)) { |
| | 578 | bh->b_blocknr = RESIDENT_LCN; |
| | 579 | bh->b_size = block_size; |
| | 580 | if (!folio) { |
| | 581 | /* direct io (read) or bmap call */ |
| | 582 | err = 0; |
| | 583 | } else { |
| | 584 | ni_lock(ni); |
| | 585 | err = attr_data_read_resident(ni, folio); |
| | 586 | ni_unlock(ni); |
| | 587 | |
| | 588 | if (!err) |
| | 589 | set_buffer_uptodate(bh); |
| | 590 | } |
| | 591 | return err; |
| | 592 | } |
| | 593 | |
| | 594 | vcn = vbo >> cluster_bits; |
| | 595 | off = vbo & sbi->cluster_mask; |
| | 596 | new = false; |
| | 597 | |
| | 598 | err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, |
| | 599 | create && sbi->cluster_size > PAGE_SIZE); |
| | 600 | if (err) |
| | 601 | goto out; |
| | 602 | |
| | 603 | if (!len) |
| | 604 | return 0; |
| | 605 | |
| | 606 | bytes = ((u64)len << cluster_bits) - off; |
| | 607 | |
| | 608 | if (lcn == SPARSE_LCN) { |
| | 609 | if (!create) { |
| | 610 | if (bh->b_size > bytes) |
| | 611 | bh->b_size = bytes; |
| | 612 | return 0; |
| | 613 | } |
| | 614 | WARN_ON(1); |
| | 615 | } |
| | 616 | |
| | 617 | if (new) |
| | 618 | set_buffer_new(bh); |
| | 619 | |
| | 620 | lbo = ((u64)lcn << cluster_bits) + off; |
| | 621 | |
| | 622 | set_buffer_mapped(bh); |
| | 623 | bh->b_bdev = sb->s_bdev; |
| | 624 | bh->b_blocknr = lbo >> sb->s_blocksize_bits; |
| | 625 | |
| | 626 | valid = ni->i_valid; |
| | 627 | |
| | 628 | if (ctx == GET_BLOCK_DIRECT_IO_W) { |
| | 629 | /* ntfs_direct_IO will update ni->i_valid. */ |
| | 630 | if (vbo >= valid) |
| | 631 | set_buffer_new(bh); |
| | 632 | } else if (create) { |
| | 633 | /* Normal write. */ |
| | 634 | if (bytes > bh->b_size) |
| | 635 | bytes = bh->b_size; |
| | 636 | |
| | 637 | if (vbo >= valid) |
| | 638 | set_buffer_new(bh); |
| | 639 | |
| | 640 | if (vbo + bytes > valid) { |
| | 641 | ni->i_valid = vbo + bytes; |
| | 642 | mark_inode_dirty(inode); |
| | 643 | } |
| | 644 | } else if (vbo >= valid) { |
| | 645 | /* Read out of valid data. */ |
| | 646 | clear_buffer_mapped(bh); |
| | 647 | } else if (vbo + bytes <= valid) { |
| | 648 | /* Normal read. */ |
| | 649 | } else if (vbo + block_size <= valid) { |
| | 650 | /* Normal short read. */ |
| | 651 | bytes = block_size; |
| | 652 | } else { |
| | 653 | /* |
| | 654 | * Read across valid size: vbo < valid && valid < vbo + block_size |
| | 655 | */ |
| | 656 | bytes = block_size; |
| | 657 | |
| | 658 | if (folio) { |
| | 659 | u32 voff = valid - vbo; |
| | 660 | |
| | 661 | bh->b_size = block_size; |
| | 662 | off = vbo & (PAGE_SIZE - 1); |
| | 663 | folio_set_bh(bh, folio, off); |
| | 664 | |
| | 665 | if (bh_read(bh, 0) < 0) { |
| | 666 | err = -EIO; |
| | 667 | goto out; |
| | 668 | } |
| | 669 | folio_zero_segment(folio, off + voff, off + block_size); |
| | 670 | } |
| | 671 | } |
| | 672 | |
| | 673 | if (bh->b_size > bytes) |
| | 674 | bh->b_size = bytes; |
| | 675 | |
| | 676 | #ifndef __LP64__ |
| | 677 | if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { |
| | 678 | static_assert(sizeof(size_t) < sizeof(loff_t)); |
| | 679 | if (bytes > 0x40000000u) |
| | 680 | bh->b_size = 0x40000000u; |
| | 681 | } |
| | 682 | #endif |
| | 683 | |
| | 684 | return 0; |
| | 685 | |
| | 686 | out: |
| | 687 | return err; |
| | 688 | } |
| | 689 | |
| | 690 | int ntfs_get_block(struct inode *inode, sector_t vbn, |
| | 691 | struct buffer_head *bh_result, int create) |
| | 692 | { |
| | 693 | return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, |
| | 694 | bh_result, create, GET_BLOCK_GENERAL); |
| | 695 | } |
| | 696 | |
| | 697 | static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, |
| | 698 | struct buffer_head *bh_result, int create) |
| | 699 | { |
| | 700 | return ntfs_get_block_vbo(inode, |
| | 701 | (u64)vsn << inode->i_sb->s_blocksize_bits, |
| | 702 | bh_result, create, GET_BLOCK_BMAP); |
| | 703 | } |
| | 704 | |
| | 705 | static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) |
| | 706 | { |
| | 707 | return generic_block_bmap(mapping, block, ntfs_get_block_bmap); |
| | 708 | } |
| | 709 | |
| | 710 | static int ntfs_read_folio(struct file *file, struct folio *folio) |
| | 711 | { |
| | 712 | int err; |
| | 713 | struct address_space *mapping = folio->mapping; |
| | 714 | struct inode *inode = mapping->host; |
| | 715 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 716 | |
| | 717 | if (is_resident(ni)) { |
| | 718 | ni_lock(ni); |
| | 719 | err = attr_data_read_resident(ni, folio); |
| | 720 | ni_unlock(ni); |
| | 721 | if (err != E_NTFS_NONRESIDENT) { |
| | 722 | folio_unlock(folio); |
| | 723 | return err; |
| | 724 | } |
| | 725 | } |
| | 726 | |
| | 727 | if (is_compressed(ni)) { |
| | 728 | ni_lock(ni); |
| | 729 | err = ni_readpage_cmpr(ni, folio); |
| | 730 | ni_unlock(ni); |
| | 731 | return err; |
| | 732 | } |
| | 733 | |
| | 734 | /* Normal + sparse files. */ |
| | 735 | return mpage_read_folio(folio, ntfs_get_block); |
| | 736 | } |
| | 737 | |
| | 738 | static void ntfs_readahead(struct readahead_control *rac) |
| | 739 | { |
| | 740 | struct address_space *mapping = rac->mapping; |
| | 741 | struct inode *inode = mapping->host; |
| | 742 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 743 | u64 valid; |
| | 744 | loff_t pos; |
| | 745 | |
| | 746 | if (is_resident(ni)) { |
| | 747 | /* No readahead for resident. */ |
| | 748 | return; |
| | 749 | } |
| | 750 | |
| | 751 | if (is_compressed(ni)) { |
| | 752 | /* No readahead for compressed. */ |
| | 753 | return; |
| | 754 | } |
| | 755 | |
| | 756 | valid = ni->i_valid; |
| | 757 | pos = readahead_pos(rac); |
| | 758 | |
| | 759 | if (valid < i_size_read(inode) && pos <= valid && |
| | 760 | valid < pos + readahead_length(rac)) { |
| | 761 | /* Range cross 'valid'. Read it page by page. */ |
| | 762 | return; |
| | 763 | } |
| | 764 | |
| | 765 | mpage_readahead(rac, ntfs_get_block); |
| | 766 | } |
| | 767 | |
| | 768 | static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, |
| | 769 | struct buffer_head *bh_result, int create) |
| | 770 | { |
| | 771 | return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, |
| | 772 | bh_result, create, GET_BLOCK_DIRECT_IO_R); |
| | 773 | } |
| | 774 | |
| | 775 | static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, |
| | 776 | struct buffer_head *bh_result, int create) |
| | 777 | { |
| | 778 | return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, |
| | 779 | bh_result, create, GET_BLOCK_DIRECT_IO_W); |
| | 780 | } |
| | 781 | |
| | 782 | static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
| | 783 | { |
| | 784 | struct file *file = iocb->ki_filp; |
| | 785 | struct address_space *mapping = file->f_mapping; |
| | 786 | struct inode *inode = mapping->host; |
| | 787 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 788 | loff_t vbo = iocb->ki_pos; |
| | 789 | loff_t end; |
| | 790 | int wr = iov_iter_rw(iter) & WRITE; |
| | 791 | size_t iter_count = iov_iter_count(iter); |
| | 792 | loff_t valid; |
| | 793 | ssize_t ret; |
| | 794 | |
| | 795 | if (is_resident(ni)) { |
| | 796 | /* Switch to buffered write. */ |
| | 797 | ret = 0; |
| | 798 | goto out; |
| | 799 | } |
| | 800 | |
| | 801 | ret = blockdev_direct_IO(iocb, inode, iter, |
| | 802 | wr ? ntfs_get_block_direct_IO_W : |
| | 803 | ntfs_get_block_direct_IO_R); |
| | 804 | |
| | 805 | if (ret > 0) |
| | 806 | end = vbo + ret; |
| | 807 | else if (wr && ret == -EIOCBQUEUED) |
| | 808 | end = vbo + iter_count; |
| | 809 | else |
| | 810 | goto out; |
| | 811 | |
| | 812 | valid = ni->i_valid; |
| | 813 | if (wr) { |
| | 814 | if (end > valid && !S_ISBLK(inode->i_mode)) { |
| | 815 | ni->i_valid = end; |
| | 816 | mark_inode_dirty(inode); |
| | 817 | } |
| | 818 | } else if (vbo < valid && valid < end) { |
| | 819 | /* Fix page. */ |
| | 820 | iov_iter_revert(iter, end - valid); |
| | 821 | iov_iter_zero(end - valid, iter); |
| | 822 | } |
| | 823 | |
| | 824 | out: |
| | 825 | return ret; |
| | 826 | } |
| | 827 | |
| | 828 | int ntfs_set_size(struct inode *inode, u64 new_size) |
| | 829 | { |
| | 830 | struct super_block *sb = inode->i_sb; |
| | 831 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
| | 832 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 833 | int err; |
| | 834 | |
| | 835 | /* Check for maximum file size. */ |
| | 836 | if (is_sparsed(ni) || is_compressed(ni)) { |
| | 837 | if (new_size > sbi->maxbytes_sparse) { |
| | 838 | err = -EFBIG; |
| | 839 | goto out; |
| | 840 | } |
| | 841 | } else if (new_size > sbi->maxbytes) { |
| | 842 | err = -EFBIG; |
| | 843 | goto out; |
| | 844 | } |
| | 845 | |
| | 846 | ni_lock(ni); |
| | 847 | down_write(&ni->file.run_lock); |
| | 848 | |
| | 849 | err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, |
| | 850 | &ni->i_valid, true, NULL); |
| | 851 | |
| | 852 | up_write(&ni->file.run_lock); |
| | 853 | ni_unlock(ni); |
| | 854 | |
| | 855 | mark_inode_dirty(inode); |
| | 856 | |
| | 857 | out: |
| | 858 | return err; |
| | 859 | } |
| | 860 | |
| | 861 | static int ntfs_resident_writepage(struct folio *folio, |
| | 862 | struct writeback_control *wbc, void *data) |
| | 863 | { |
| | 864 | struct address_space *mapping = data; |
| | 865 | struct inode *inode = mapping->host; |
| | 866 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 867 | int ret; |
| | 868 | |
| | 869 | if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) |
| | 870 | return -EIO; |
| | 871 | |
| | 872 | ni_lock(ni); |
| | 873 | ret = attr_data_write_resident(ni, folio); |
| | 874 | ni_unlock(ni); |
| | 875 | |
| | 876 | if (ret != E_NTFS_NONRESIDENT) |
| | 877 | folio_unlock(folio); |
| | 878 | mapping_set_error(mapping, ret); |
| | 879 | return ret; |
| | 880 | } |
| | 881 | |
| | 882 | static int ntfs_writepages(struct address_space *mapping, |
| | 883 | struct writeback_control *wbc) |
| | 884 | { |
| | 885 | struct inode *inode = mapping->host; |
| | 886 | |
| | 887 | if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) |
| | 888 | return -EIO; |
| | 889 | |
| | 890 | if (is_resident(ntfs_i(inode))) |
| | 891 | return write_cache_pages(mapping, wbc, ntfs_resident_writepage, |
| | 892 | mapping); |
| | 893 | return mpage_writepages(mapping, wbc, ntfs_get_block); |
| | 894 | } |
| | 895 | |
| | 896 | static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, |
| | 897 | struct buffer_head *bh_result, int create) |
| | 898 | { |
| | 899 | return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, |
| | 900 | bh_result, create, GET_BLOCK_WRITE_BEGIN); |
| | 901 | } |
| | 902 | |
| | 903 | int ntfs_write_begin(struct file *file, struct address_space *mapping, |
| | 904 | loff_t pos, u32 len, struct folio **foliop, void **fsdata) |
| | 905 | { |
| | 906 | int err; |
| | 907 | struct inode *inode = mapping->host; |
| | 908 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 909 | |
| | 910 | if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) |
| | 911 | return -EIO; |
| | 912 | |
| | 913 | if (is_resident(ni)) { |
| | 914 | struct folio *folio = __filemap_get_folio( |
| | 915 | mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN, |
| | 916 | mapping_gfp_mask(mapping)); |
| | 917 | |
| | 918 | if (IS_ERR(folio)) { |
| | 919 | err = PTR_ERR(folio); |
| | 920 | goto out; |
| | 921 | } |
| | 922 | |
| | 923 | ni_lock(ni); |
| | 924 | err = attr_data_read_resident(ni, folio); |
| | 925 | ni_unlock(ni); |
| | 926 | |
| | 927 | if (!err) { |
| | 928 | *foliop = folio; |
| | 929 | goto out; |
| | 930 | } |
| | 931 | folio_unlock(folio); |
| | 932 | folio_put(folio); |
| | 933 | |
| | 934 | if (err != E_NTFS_NONRESIDENT) |
| | 935 | goto out; |
| | 936 | } |
| | 937 | |
| | 938 | err = block_write_begin(mapping, pos, len, foliop, |
| | 939 | ntfs_get_block_write_begin); |
| | 940 | |
| | 941 | out: |
| | 942 | return err; |
| | 943 | } |
| | 944 | |
| | 945 | /* |
| | 946 | * ntfs_write_end - Address_space_operations::write_end. |
| | 947 | */ |
| | 948 | int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, |
| | 949 | u32 len, u32 copied, struct folio *folio, void *fsdata) |
| | 950 | { |
| | 951 | struct inode *inode = mapping->host; |
| | 952 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 953 | u64 valid = ni->i_valid; |
| | 954 | bool dirty = false; |
| | 955 | int err; |
| | 956 | |
| | 957 | if (is_resident(ni)) { |
| | 958 | ni_lock(ni); |
| | 959 | err = attr_data_write_resident(ni, folio); |
| | 960 | ni_unlock(ni); |
| | 961 | if (!err) { |
| | 962 | struct buffer_head *head = folio_buffers(folio); |
| | 963 | dirty = true; |
| | 964 | /* Clear any buffers in folio. */ |
| | 965 | if (head) { |
| | 966 | struct buffer_head *bh = head; |
| | 967 | |
| | 968 | do { |
| | 969 | clear_buffer_dirty(bh); |
| | 970 | clear_buffer_mapped(bh); |
| | 971 | set_buffer_uptodate(bh); |
| | 972 | } while (head != (bh = bh->b_this_page)); |
| | 973 | } |
| | 974 | folio_mark_uptodate(folio); |
| | 975 | err = copied; |
| | 976 | } |
| | 977 | folio_unlock(folio); |
| | 978 | folio_put(folio); |
| | 979 | } else { |
| | 980 | err = generic_write_end(file, mapping, pos, len, copied, folio, |
| | 981 | fsdata); |
| | 982 | } |
| | 983 | |
| | 984 | if (err >= 0) { |
| | 985 | if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { |
| | 986 | inode_set_mtime_to_ts(inode, |
| | 987 | inode_set_ctime_current(inode)); |
| | 988 | ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; |
| | 989 | dirty = true; |
| | 990 | } |
| | 991 | |
| | 992 | if (valid != ni->i_valid) { |
| | 993 | /* ni->i_valid is changed in ntfs_get_block_vbo. */ |
| | 994 | dirty = true; |
| | 995 | } |
| | 996 | |
| | 997 | if (pos + err > inode->i_size) { |
| | 998 | i_size_write(inode, pos + err); |
| | 999 | dirty = true; |
| | 1000 | } |
| | 1001 | |
| | 1002 | if (dirty) |
| | 1003 | mark_inode_dirty(inode); |
| | 1004 | } |
| | 1005 | |
| | 1006 | return err; |
| | 1007 | } |
| | 1008 | |
| | 1009 | int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) |
| | 1010 | { |
| | 1011 | return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
| | 1012 | } |
| | 1013 | |
| | 1014 | int ntfs_sync_inode(struct inode *inode) |
| | 1015 | { |
| | 1016 | return _ni_write_inode(inode, 1); |
| | 1017 | } |
| | 1018 | |
| | 1019 | /* |
| | 1020 | * writeback_inode - Helper function for ntfs_flush_inodes(). |
| | 1021 | * |
| | 1022 | * This writes both the inode and the file data blocks, waiting |
| | 1023 | * for in flight data blocks before the start of the call. It |
| | 1024 | * does not wait for any io started during the call. |
| | 1025 | */ |
| | 1026 | static int writeback_inode(struct inode *inode) |
| | 1027 | { |
| | 1028 | int ret = sync_inode_metadata(inode, 0); |
| | 1029 | |
| | 1030 | if (!ret) |
| | 1031 | ret = filemap_fdatawrite(inode->i_mapping); |
| | 1032 | return ret; |
| | 1033 | } |
| | 1034 | |
| | 1035 | /* |
| | 1036 | * ntfs_flush_inodes |
| | 1037 | * |
| | 1038 | * Write data and metadata corresponding to i1 and i2. The io is |
| | 1039 | * started but we do not wait for any of it to finish. |
| | 1040 | * |
| | 1041 | * filemap_flush() is used for the block device, so if there is a dirty |
| | 1042 | * page for a block already in flight, we will not wait and start the |
| | 1043 | * io over again. |
| | 1044 | */ |
| | 1045 | int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, |
| | 1046 | struct inode *i2) |
| | 1047 | { |
| | 1048 | int ret = 0; |
| | 1049 | |
| | 1050 | if (i1) |
| | 1051 | ret = writeback_inode(i1); |
| | 1052 | if (!ret && i2) |
| | 1053 | ret = writeback_inode(i2); |
| | 1054 | if (!ret) |
| | 1055 | ret = filemap_flush(sb->s_bdev_file->f_mapping); |
| | 1056 | return ret; |
| | 1057 | } |
| | 1058 | |
| | 1059 | /* |
| | 1060 | * Helper function to read file. |
| | 1061 | */ |
| | 1062 | int inode_read_data(struct inode *inode, void *data, size_t bytes) |
| | 1063 | { |
| | 1064 | pgoff_t idx; |
| | 1065 | struct address_space *mapping = inode->i_mapping; |
| | 1066 | |
| | 1067 | for (idx = 0; bytes; idx++) { |
| | 1068 | size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; |
| | 1069 | struct page *page = read_mapping_page(mapping, idx, NULL); |
| | 1070 | void *kaddr; |
| | 1071 | |
| | 1072 | if (IS_ERR(page)) |
| | 1073 | return PTR_ERR(page); |
| | 1074 | |
| | 1075 | kaddr = kmap_atomic(page); |
| | 1076 | memcpy(data, kaddr, op); |
| | 1077 | kunmap_atomic(kaddr); |
| | 1078 | |
| | 1079 | put_page(page); |
| | 1080 | |
| | 1081 | bytes -= op; |
| | 1082 | data = Add2Ptr(data, PAGE_SIZE); |
| | 1083 | } |
| | 1084 | return 0; |
| | 1085 | } |
| | 1086 | |
| | 1087 | /* |
| | 1088 | * ntfs_reparse_bytes |
| | 1089 | * |
| | 1090 | * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) |
| | 1091 | * for unicode string of @uni_len length. |
| | 1092 | */ |
| | 1093 | static inline u32 ntfs_reparse_bytes(u32 uni_len) |
| | 1094 | { |
| | 1095 | /* Header + unicode string + decorated unicode string. */ |
| | 1096 | return sizeof(short) * (2 * uni_len + 4) + |
| | 1097 | offsetof(struct REPARSE_DATA_BUFFER, |
| | 1098 | SymbolicLinkReparseBuffer.PathBuffer); |
| | 1099 | } |
| | 1100 | |
| | 1101 | static struct REPARSE_DATA_BUFFER * |
| | 1102 | ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, |
| | 1103 | u32 size, u16 *nsize) |
| | 1104 | { |
| | 1105 | int i, err; |
| | 1106 | struct REPARSE_DATA_BUFFER *rp; |
| | 1107 | __le16 *rp_name; |
| | 1108 | typeof(rp->SymbolicLinkReparseBuffer) *rs; |
| | 1109 | |
| | 1110 | rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); |
| | 1111 | if (!rp) |
| | 1112 | return ERR_PTR(-ENOMEM); |
| | 1113 | |
| | 1114 | rs = &rp->SymbolicLinkReparseBuffer; |
| | 1115 | rp_name = rs->PathBuffer; |
| | 1116 | |
| | 1117 | /* Convert link name to UTF-16. */ |
| | 1118 | err = ntfs_nls_to_utf16(sbi, symname, size, |
| | 1119 | (struct cpu_str *)(rp_name - 1), 2 * size, |
| | 1120 | UTF16_LITTLE_ENDIAN); |
| | 1121 | if (err < 0) |
| | 1122 | goto out; |
| | 1123 | |
| | 1124 | /* err = the length of unicode name of symlink. */ |
| | 1125 | *nsize = ntfs_reparse_bytes(err); |
| | 1126 | |
| | 1127 | if (*nsize > sbi->reparse.max_size) { |
| | 1128 | err = -EFBIG; |
| | 1129 | goto out; |
| | 1130 | } |
| | 1131 | |
| | 1132 | /* Translate Linux '/' into Windows '\'. */ |
| | 1133 | for (i = 0; i < err; i++) { |
| | 1134 | if (rp_name[i] == cpu_to_le16('/')) |
| | 1135 | rp_name[i] = cpu_to_le16('\\'); |
| | 1136 | } |
| | 1137 | |
| | 1138 | rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; |
| | 1139 | rp->ReparseDataLength = |
| | 1140 | cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, |
| | 1141 | SymbolicLinkReparseBuffer)); |
| | 1142 | |
| | 1143 | /* PrintName + SubstituteName. */ |
| | 1144 | rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); |
| | 1145 | rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); |
| | 1146 | rs->PrintNameLength = rs->SubstituteNameOffset; |
| | 1147 | |
| | 1148 | /* |
| | 1149 | * TODO: Use relative path if possible to allow Windows to |
| | 1150 | * parse this path. |
| | 1151 | * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). |
| | 1152 | */ |
| | 1153 | rs->Flags = 0; |
| | 1154 | |
| | 1155 | memmove(rp_name + err + 4, rp_name, sizeof(short) * err); |
| | 1156 | |
| | 1157 | /* Decorate SubstituteName. */ |
| | 1158 | rp_name += err; |
| | 1159 | rp_name[0] = cpu_to_le16('\\'); |
| | 1160 | rp_name[1] = cpu_to_le16('?'); |
| | 1161 | rp_name[2] = cpu_to_le16('?'); |
| | 1162 | rp_name[3] = cpu_to_le16('\\'); |
| | 1163 | |
| | 1164 | return rp; |
| | 1165 | out: |
| | 1166 | kfree(rp); |
| | 1167 | return ERR_PTR(err); |
| | 1168 | } |
| | 1169 | |
| | 1170 | /* |
| | 1171 | * ntfs_create_inode |
| | 1172 | * |
| | 1173 | * Helper function for: |
| | 1174 | * - ntfs_create |
| | 1175 | * - ntfs_mknod |
| | 1176 | * - ntfs_symlink |
| | 1177 | * - ntfs_mkdir |
| | 1178 | * - ntfs_atomic_open |
| | 1179 | * |
| | 1180 | * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked |
| | 1181 | */ |
| | 1182 | int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, |
| | 1183 | struct dentry *dentry, const struct cpu_str *uni, |
| | 1184 | umode_t mode, dev_t dev, const char *symname, u32 size, |
| | 1185 | struct ntfs_fnd *fnd) |
| | 1186 | { |
| | 1187 | int err; |
| | 1188 | struct super_block *sb = dir->i_sb; |
| | 1189 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
| | 1190 | const struct qstr *name = &dentry->d_name; |
| | 1191 | CLST ino = 0; |
| | 1192 | struct ntfs_inode *dir_ni = ntfs_i(dir); |
| | 1193 | struct ntfs_inode *ni = NULL; |
| | 1194 | struct inode *inode = NULL; |
| | 1195 | struct ATTRIB *attr; |
| | 1196 | struct ATTR_STD_INFO5 *std5; |
| | 1197 | struct ATTR_FILE_NAME *fname; |
| | 1198 | struct MFT_REC *rec; |
| | 1199 | u32 asize, dsize, sd_size; |
| | 1200 | enum FILE_ATTRIBUTE fa; |
| | 1201 | __le32 security_id = SECURITY_ID_INVALID; |
| | 1202 | CLST vcn; |
| | 1203 | const void *sd; |
| | 1204 | u16 t16, nsize = 0, aid = 0; |
| | 1205 | struct INDEX_ROOT *root, *dir_root; |
| | 1206 | struct NTFS_DE *e, *new_de = NULL; |
| | 1207 | struct REPARSE_DATA_BUFFER *rp = NULL; |
| | 1208 | bool rp_inserted = false; |
| | 1209 | |
| | 1210 | /* New file will be resident or non resident. */ |
| | 1211 | const bool new_file_resident = 1; |
| | 1212 | |
| | 1213 | if (!fnd) |
| | 1214 | ni_lock_dir(dir_ni); |
| | 1215 | |
| | 1216 | dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); |
| | 1217 | if (!dir_root) { |
| | 1218 | err = -EINVAL; |
| | 1219 | goto out1; |
| | 1220 | } |
| | 1221 | |
| | 1222 | if (S_ISDIR(mode)) { |
| | 1223 | /* Use parent's directory attributes. */ |
| | 1224 | fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | |
| | 1225 | FILE_ATTRIBUTE_ARCHIVE; |
| | 1226 | /* |
| | 1227 | * By default child directory inherits parent attributes. |
| | 1228 | * Root directory is hidden + system. |
| | 1229 | * Make an exception for children in root. |
| | 1230 | */ |
| | 1231 | if (dir->i_ino == MFT_REC_ROOT) |
| | 1232 | fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); |
| | 1233 | } else if (S_ISLNK(mode)) { |
| | 1234 | /* It is good idea that link should be the same type (file/dir) as target */ |
| | 1235 | fa = FILE_ATTRIBUTE_REPARSE_POINT; |
| | 1236 | |
| | 1237 | /* |
| | 1238 | * Linux: there are dir/file/symlink and so on. |
| | 1239 | * NTFS: symlinks are "dir + reparse" or "file + reparse" |
| | 1240 | * It is good idea to create: |
| | 1241 | * dir + reparse if 'symname' points to directory |
| | 1242 | * or |
| | 1243 | * file + reparse if 'symname' points to file |
| | 1244 | * Unfortunately kern_path hangs if symname contains 'dir'. |
| | 1245 | */ |
| | 1246 | |
| | 1247 | /* |
| | 1248 | * struct path path; |
| | 1249 | * |
| | 1250 | * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ |
| | 1251 | * struct inode *target = d_inode(path.dentry); |
| | 1252 | * |
| | 1253 | * if (S_ISDIR(target->i_mode)) |
| | 1254 | * fa |= FILE_ATTRIBUTE_DIRECTORY; |
| | 1255 | * // if ( target->i_sb == sb ){ |
| | 1256 | * // use relative path? |
| | 1257 | * // } |
| | 1258 | * path_put(&path); |
| | 1259 | * } |
| | 1260 | */ |
| | 1261 | } else if (S_ISREG(mode)) { |
| | 1262 | if (sbi->options->sparse) { |
| | 1263 | /* Sparsed regular file, cause option 'sparse'. */ |
| | 1264 | fa = FILE_ATTRIBUTE_SPARSE_FILE | |
| | 1265 | FILE_ATTRIBUTE_ARCHIVE; |
| | 1266 | } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { |
| | 1267 | /* Compressed regular file, if parent is compressed. */ |
| | 1268 | fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; |
| | 1269 | } else { |
| | 1270 | /* Regular file, default attributes. */ |
| | 1271 | fa = FILE_ATTRIBUTE_ARCHIVE; |
| | 1272 | } |
| | 1273 | } else { |
| | 1274 | fa = FILE_ATTRIBUTE_ARCHIVE; |
| | 1275 | } |
| | 1276 | |
| | 1277 | /* If option "hide_dot_files" then set hidden attribute for dot files. */ |
| | 1278 | if (sbi->options->hide_dot_files && name->name[0] == '.') |
| | 1279 | fa |= FILE_ATTRIBUTE_HIDDEN; |
| | 1280 | |
| | 1281 | if (!(mode & 0222)) |
| | 1282 | fa |= FILE_ATTRIBUTE_READONLY; |
| | 1283 | |
| | 1284 | /* Allocate PATH_MAX bytes. */ |
| | 1285 | new_de = __getname(); |
| | 1286 | if (!new_de) { |
| | 1287 | err = -ENOMEM; |
| | 1288 | goto out1; |
| | 1289 | } |
| | 1290 | |
| | 1291 | if (unlikely(ntfs3_forced_shutdown(sb))) { |
| | 1292 | err = -EIO; |
| | 1293 | goto out2; |
| | 1294 | } |
| | 1295 | |
| | 1296 | /* Mark rw ntfs as dirty. it will be cleared at umount. */ |
| | 1297 | ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); |
| | 1298 | |
| | 1299 | /* Step 1: allocate and fill new mft record. */ |
| | 1300 | err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); |
| | 1301 | if (err) |
| | 1302 | goto out2; |
| | 1303 | |
| | 1304 | ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); |
| | 1305 | if (IS_ERR(ni)) { |
| | 1306 | err = PTR_ERR(ni); |
| | 1307 | ni = NULL; |
| | 1308 | goto out3; |
| | 1309 | } |
| | 1310 | inode = &ni->vfs_inode; |
| | 1311 | inode_init_owner(idmap, inode, dir, mode); |
| | 1312 | mode = inode->i_mode; |
| | 1313 | |
| | 1314 | ni->i_crtime = current_time(inode); |
| | 1315 | |
| | 1316 | rec = ni->mi.mrec; |
| | 1317 | rec->hard_links = cpu_to_le16(1); |
| | 1318 | attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); |
| | 1319 | |
| | 1320 | /* Get default security id. */ |
| | 1321 | sd = s_default_security; |
| | 1322 | sd_size = sizeof(s_default_security); |
| | 1323 | |
| | 1324 | if (is_ntfs3(sbi)) { |
| | 1325 | security_id = dir_ni->std_security_id; |
| | 1326 | if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { |
| | 1327 | security_id = sbi->security.def_security_id; |
| | 1328 | |
| | 1329 | if (security_id == SECURITY_ID_INVALID && |
| | 1330 | !ntfs_insert_security(sbi, sd, sd_size, |
| | 1331 | &security_id, NULL)) |
| | 1332 | sbi->security.def_security_id = security_id; |
| | 1333 | } |
| | 1334 | } |
| | 1335 | |
| | 1336 | /* Insert standard info. */ |
| | 1337 | std5 = Add2Ptr(attr, SIZEOF_RESIDENT); |
| | 1338 | |
| | 1339 | if (security_id == SECURITY_ID_INVALID) { |
| | 1340 | dsize = sizeof(struct ATTR_STD_INFO); |
| | 1341 | } else { |
| | 1342 | dsize = sizeof(struct ATTR_STD_INFO5); |
| | 1343 | std5->security_id = security_id; |
| | 1344 | ni->std_security_id = security_id; |
| | 1345 | } |
| | 1346 | asize = SIZEOF_RESIDENT + dsize; |
| | 1347 | |
| | 1348 | attr->type = ATTR_STD; |
| | 1349 | attr->size = cpu_to_le32(asize); |
| | 1350 | attr->id = cpu_to_le16(aid++); |
| | 1351 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
| | 1352 | attr->res.data_size = cpu_to_le32(dsize); |
| | 1353 | |
| | 1354 | std5->cr_time = std5->m_time = std5->c_time = std5->a_time = |
| | 1355 | kernel2nt(&ni->i_crtime); |
| | 1356 | |
| | 1357 | std5->fa = ni->std_fa = fa; |
| | 1358 | |
| | 1359 | attr = Add2Ptr(attr, asize); |
| | 1360 | |
| | 1361 | /* Insert file name. */ |
| | 1362 | err = fill_name_de(sbi, new_de, name, uni); |
| | 1363 | if (err) |
| | 1364 | goto out4; |
| | 1365 | |
| | 1366 | mi_get_ref(&ni->mi, &new_de->ref); |
| | 1367 | |
| | 1368 | fname = (struct ATTR_FILE_NAME *)(new_de + 1); |
| | 1369 | |
| | 1370 | if (sbi->options->windows_names && |
| | 1371 | !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { |
| | 1372 | err = -EINVAL; |
| | 1373 | goto out4; |
| | 1374 | } |
| | 1375 | |
| | 1376 | mi_get_ref(&dir_ni->mi, &fname->home); |
| | 1377 | fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = |
| | 1378 | fname->dup.a_time = std5->cr_time; |
| | 1379 | fname->dup.alloc_size = fname->dup.data_size = 0; |
| | 1380 | fname->dup.fa = std5->fa; |
| | 1381 | fname->dup.ea_size = fname->dup.reparse = 0; |
| | 1382 | |
| | 1383 | dsize = le16_to_cpu(new_de->key_size); |
| | 1384 | asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); |
| | 1385 | |
| | 1386 | attr->type = ATTR_NAME; |
| | 1387 | attr->size = cpu_to_le32(asize); |
| | 1388 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
| | 1389 | attr->res.flags = RESIDENT_FLAG_INDEXED; |
| | 1390 | attr->id = cpu_to_le16(aid++); |
| | 1391 | attr->res.data_size = cpu_to_le32(dsize); |
| | 1392 | memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); |
| | 1393 | |
| | 1394 | attr = Add2Ptr(attr, asize); |
| | 1395 | |
| | 1396 | if (security_id == SECURITY_ID_INVALID) { |
| | 1397 | /* Insert security attribute. */ |
| | 1398 | asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); |
| | 1399 | |
| | 1400 | attr->type = ATTR_SECURE; |
| | 1401 | attr->size = cpu_to_le32(asize); |
| | 1402 | attr->id = cpu_to_le16(aid++); |
| | 1403 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
| | 1404 | attr->res.data_size = cpu_to_le32(sd_size); |
| | 1405 | memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); |
| | 1406 | |
| | 1407 | attr = Add2Ptr(attr, asize); |
| | 1408 | } |
| | 1409 | |
| | 1410 | attr->id = cpu_to_le16(aid++); |
| | 1411 | if (fa & FILE_ATTRIBUTE_DIRECTORY) { |
| | 1412 | /* |
| | 1413 | * Regular directory or symlink to directory. |
| | 1414 | * Create root attribute. |
| | 1415 | */ |
| | 1416 | dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); |
| | 1417 | asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; |
| | 1418 | |
| | 1419 | attr->type = ATTR_ROOT; |
| | 1420 | attr->size = cpu_to_le32(asize); |
| | 1421 | |
| | 1422 | attr->name_len = ARRAY_SIZE(I30_NAME); |
| | 1423 | attr->name_off = SIZEOF_RESIDENT_LE; |
| | 1424 | attr->res.data_off = |
| | 1425 | cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); |
| | 1426 | attr->res.data_size = cpu_to_le32(dsize); |
| | 1427 | memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, |
| | 1428 | sizeof(I30_NAME)); |
| | 1429 | |
| | 1430 | root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); |
| | 1431 | memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); |
| | 1432 | root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); |
| | 1433 | root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + |
| | 1434 | sizeof(struct NTFS_DE)); |
| | 1435 | root->ihdr.total = root->ihdr.used; |
| | 1436 | |
| | 1437 | e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); |
| | 1438 | e->size = cpu_to_le16(sizeof(struct NTFS_DE)); |
| | 1439 | e->flags = NTFS_IE_LAST; |
| | 1440 | } else if (S_ISLNK(mode)) { |
| | 1441 | /* |
| | 1442 | * Symlink to file. |
| | 1443 | * Create empty resident data attribute. |
| | 1444 | */ |
| | 1445 | asize = SIZEOF_RESIDENT; |
| | 1446 | |
| | 1447 | /* Insert empty ATTR_DATA */ |
| | 1448 | attr->type = ATTR_DATA; |
| | 1449 | attr->size = cpu_to_le32(SIZEOF_RESIDENT); |
| | 1450 | attr->name_off = SIZEOF_RESIDENT_LE; |
| | 1451 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
| | 1452 | } else if (!new_file_resident && S_ISREG(mode)) { |
| | 1453 | /* |
| | 1454 | * Regular file. Create empty non resident data attribute. |
| | 1455 | */ |
| | 1456 | attr->type = ATTR_DATA; |
| | 1457 | attr->non_res = 1; |
| | 1458 | attr->nres.evcn = cpu_to_le64(-1ll); |
| | 1459 | if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { |
| | 1460 | attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); |
| | 1461 | attr->name_off = SIZEOF_NONRESIDENT_EX_LE; |
| | 1462 | attr->flags = ATTR_FLAG_SPARSED; |
| | 1463 | asize = SIZEOF_NONRESIDENT_EX + 8; |
| | 1464 | } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { |
| | 1465 | attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); |
| | 1466 | attr->name_off = SIZEOF_NONRESIDENT_EX_LE; |
| | 1467 | attr->flags = ATTR_FLAG_COMPRESSED; |
| | 1468 | attr->nres.c_unit = NTFS_LZNT_CUNIT; |
| | 1469 | asize = SIZEOF_NONRESIDENT_EX + 8; |
| | 1470 | } else { |
| | 1471 | attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); |
| | 1472 | attr->name_off = SIZEOF_NONRESIDENT_LE; |
| | 1473 | asize = SIZEOF_NONRESIDENT + 8; |
| | 1474 | } |
| | 1475 | attr->nres.run_off = attr->name_off; |
| | 1476 | } else { |
| | 1477 | /* |
| | 1478 | * Node. Create empty resident data attribute. |
| | 1479 | */ |
| | 1480 | attr->type = ATTR_DATA; |
| | 1481 | attr->size = cpu_to_le32(SIZEOF_RESIDENT); |
| | 1482 | attr->name_off = SIZEOF_RESIDENT_LE; |
| | 1483 | if (fa & FILE_ATTRIBUTE_SPARSE_FILE) |
| | 1484 | attr->flags = ATTR_FLAG_SPARSED; |
| | 1485 | else if (fa & FILE_ATTRIBUTE_COMPRESSED) |
| | 1486 | attr->flags = ATTR_FLAG_COMPRESSED; |
| | 1487 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
| | 1488 | asize = SIZEOF_RESIDENT; |
| | 1489 | ni->ni_flags |= NI_FLAG_RESIDENT; |
| | 1490 | } |
| | 1491 | |
| | 1492 | if (S_ISDIR(mode)) { |
| | 1493 | ni->ni_flags |= NI_FLAG_DIR; |
| | 1494 | err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); |
| | 1495 | if (err) |
| | 1496 | goto out4; |
| | 1497 | } else if (S_ISLNK(mode)) { |
| | 1498 | rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); |
| | 1499 | |
| | 1500 | if (IS_ERR(rp)) { |
| | 1501 | err = PTR_ERR(rp); |
| | 1502 | rp = NULL; |
| | 1503 | goto out4; |
| | 1504 | } |
| | 1505 | |
| | 1506 | /* |
| | 1507 | * Insert ATTR_REPARSE. |
| | 1508 | */ |
| | 1509 | attr = Add2Ptr(attr, asize); |
| | 1510 | attr->type = ATTR_REPARSE; |
| | 1511 | attr->id = cpu_to_le16(aid++); |
| | 1512 | |
| | 1513 | /* Resident or non resident? */ |
| | 1514 | asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); |
| | 1515 | t16 = PtrOffset(rec, attr); |
| | 1516 | |
| | 1517 | /* |
| | 1518 | * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. |
| | 1519 | * It is good idea to keep extended attributes resident. |
| | 1520 | */ |
| | 1521 | if (asize + t16 + 0x78 + 8 > sbi->record_size) { |
| | 1522 | CLST alen; |
| | 1523 | CLST clst = bytes_to_cluster(sbi, nsize); |
| | 1524 | |
| | 1525 | /* Bytes per runs. */ |
| | 1526 | t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; |
| | 1527 | |
| | 1528 | attr->non_res = 1; |
| | 1529 | attr->nres.evcn = cpu_to_le64(clst - 1); |
| | 1530 | attr->name_off = SIZEOF_NONRESIDENT_LE; |
| | 1531 | attr->nres.run_off = attr->name_off; |
| | 1532 | attr->nres.data_size = cpu_to_le64(nsize); |
| | 1533 | attr->nres.valid_size = attr->nres.data_size; |
| | 1534 | attr->nres.alloc_size = |
| | 1535 | cpu_to_le64(ntfs_up_cluster(sbi, nsize)); |
| | 1536 | |
| | 1537 | err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, |
| | 1538 | clst, NULL, ALLOCATE_DEF, |
| | 1539 | &alen, 0, NULL, NULL); |
| | 1540 | if (err) |
| | 1541 | goto out5; |
| | 1542 | |
| | 1543 | err = run_pack(&ni->file.run, 0, clst, |
| | 1544 | Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, |
| | 1545 | &vcn); |
| | 1546 | if (err < 0) |
| | 1547 | goto out5; |
| | 1548 | |
| | 1549 | if (vcn != clst) { |
| | 1550 | err = -EINVAL; |
| | 1551 | goto out5; |
| | 1552 | } |
| | 1553 | |
| | 1554 | asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); |
| | 1555 | /* Write non resident data. */ |
| | 1556 | err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, |
| | 1557 | nsize, 0); |
| | 1558 | if (err) |
| | 1559 | goto out5; |
| | 1560 | } else { |
| | 1561 | attr->res.data_off = SIZEOF_RESIDENT_LE; |
| | 1562 | attr->res.data_size = cpu_to_le32(nsize); |
| | 1563 | memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); |
| | 1564 | } |
| | 1565 | /* Size of symlink equals the length of input string. */ |
| | 1566 | inode->i_size = size; |
| | 1567 | |
| | 1568 | attr->size = cpu_to_le32(asize); |
| | 1569 | |
| | 1570 | err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, |
| | 1571 | &new_de->ref); |
| | 1572 | if (err) |
| | 1573 | goto out5; |
| | 1574 | |
| | 1575 | rp_inserted = true; |
| | 1576 | } |
| | 1577 | |
| | 1578 | attr = Add2Ptr(attr, asize); |
| | 1579 | attr->type = ATTR_END; |
| | 1580 | |
| | 1581 | rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); |
| | 1582 | rec->next_attr_id = cpu_to_le16(aid); |
| | 1583 | |
| | 1584 | inode->i_generation = le16_to_cpu(rec->seq); |
| | 1585 | |
| | 1586 | if (S_ISDIR(mode)) { |
| | 1587 | inode->i_op = &ntfs_dir_inode_operations; |
| | 1588 | inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? |
| | 1589 | &ntfs_legacy_dir_operations : |
| | 1590 | &ntfs_dir_operations; |
| | 1591 | } else if (S_ISLNK(mode)) { |
| | 1592 | inode->i_op = &ntfs_link_inode_operations; |
| | 1593 | inode->i_fop = NULL; |
| | 1594 | inode->i_mapping->a_ops = &ntfs_aops; |
| | 1595 | inode->i_size = size; |
| | 1596 | inode_nohighmem(inode); |
| | 1597 | } else if (S_ISREG(mode)) { |
| | 1598 | inode->i_op = &ntfs_file_inode_operations; |
| | 1599 | inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? |
| | 1600 | &ntfs_legacy_file_operations : |
| | 1601 | &ntfs_file_operations; |
| | 1602 | inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : |
| | 1603 | &ntfs_aops; |
| | 1604 | init_rwsem(&ni->file.run_lock); |
| | 1605 | } else { |
| | 1606 | inode->i_op = &ntfs_special_inode_operations; |
| | 1607 | init_special_inode(inode, mode, dev); |
| | 1608 | } |
| | 1609 | |
| | 1610 | #ifdef CONFIG_NTFS3_FS_POSIX_ACL |
| | 1611 | if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { |
| | 1612 | err = ntfs_init_acl(idmap, inode, dir); |
| | 1613 | if (err) |
| | 1614 | goto out5; |
| | 1615 | } else |
| | 1616 | #endif |
| | 1617 | { |
| | 1618 | inode->i_flags |= S_NOSEC; |
| | 1619 | } |
| | 1620 | |
| | 1621 | /* |
| | 1622 | * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. |
| | 1623 | * The packed size of extended attribute is stored in direntry too. |
| | 1624 | * 'fname' here points to inside new_de. |
| | 1625 | */ |
| | 1626 | err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size); |
| | 1627 | if (err) |
| | 1628 | goto out6; |
| | 1629 | |
| | 1630 | /* |
| | 1631 | * update ea_size in file_name attribute too. |
| | 1632 | * Use ni_find_attr cause layout of MFT record may be changed |
| | 1633 | * in ntfs_init_acl and ntfs_save_wsl_perm. |
| | 1634 | */ |
| | 1635 | attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); |
| | 1636 | if (attr) { |
| | 1637 | struct ATTR_FILE_NAME *fn; |
| | 1638 | |
| | 1639 | fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); |
| | 1640 | if (fn) |
| | 1641 | fn->dup.ea_size = fname->dup.ea_size; |
| | 1642 | } |
| | 1643 | |
| | 1644 | /* We do not need to update parent directory later */ |
| | 1645 | ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; |
| | 1646 | |
| | 1647 | /* Step 2: Add new name in index. */ |
| | 1648 | err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); |
| | 1649 | if (err) |
| | 1650 | goto out6; |
| | 1651 | |
| | 1652 | /* |
| | 1653 | * Call 'd_instantiate' after inode->i_op is set |
| | 1654 | * but before finish_open. |
| | 1655 | */ |
| | 1656 | d_instantiate(dentry, inode); |
| | 1657 | |
| | 1658 | /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ |
| | 1659 | inode_set_atime_to_ts(inode, ni->i_crtime); |
| | 1660 | inode_set_ctime_to_ts(inode, ni->i_crtime); |
| | 1661 | inode_set_mtime_to_ts(inode, ni->i_crtime); |
| | 1662 | inode_set_mtime_to_ts(dir, ni->i_crtime); |
| | 1663 | inode_set_ctime_to_ts(dir, ni->i_crtime); |
| | 1664 | |
| | 1665 | mark_inode_dirty(dir); |
| | 1666 | mark_inode_dirty(inode); |
| | 1667 | |
| | 1668 | /* Normal exit. */ |
| | 1669 | goto out2; |
| | 1670 | |
| | 1671 | out6: |
| | 1672 | attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL); |
| | 1673 | if (attr && attr->non_res) { |
| | 1674 | /* Delete ATTR_EA, if non-resident. */ |
| | 1675 | attr_set_size(ni, ATTR_EA, NULL, 0, NULL, 0, NULL, false, NULL); |
| | 1676 | } |
| | 1677 | |
| | 1678 | if (rp_inserted) |
| | 1679 | ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); |
| | 1680 | |
| | 1681 | out5: |
| | 1682 | if (!S_ISDIR(mode)) |
| | 1683 | run_deallocate(sbi, &ni->file.run, false); |
| | 1684 | |
| | 1685 | out4: |
| | 1686 | clear_rec_inuse(rec); |
| | 1687 | clear_nlink(inode); |
| | 1688 | ni->mi.dirty = false; |
| | 1689 | discard_new_inode(inode); |
| | 1690 | out3: |
| | 1691 | ntfs_mark_rec_free(sbi, ino, false); |
| | 1692 | |
| | 1693 | out2: |
| | 1694 | __putname(new_de); |
| | 1695 | kfree(rp); |
| | 1696 | |
| | 1697 | out1: |
| | 1698 | if (!fnd) |
| | 1699 | ni_unlock(dir_ni); |
| | 1700 | |
| | 1701 | if (!err) |
| | 1702 | unlock_new_inode(inode); |
| | 1703 | |
| | 1704 | return err; |
| | 1705 | } |
| | 1706 | |
| | 1707 | int ntfs_link_inode(struct inode *inode, struct dentry *dentry) |
| | 1708 | { |
| | 1709 | int err; |
| | 1710 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 1711 | struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; |
| | 1712 | struct NTFS_DE *de; |
| | 1713 | |
| | 1714 | /* Allocate PATH_MAX bytes. */ |
| | 1715 | de = __getname(); |
| | 1716 | if (!de) |
| | 1717 | return -ENOMEM; |
| | 1718 | |
| | 1719 | /* Mark rw ntfs as dirty. It will be cleared at umount. */ |
| | 1720 | ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); |
| | 1721 | |
| | 1722 | /* Construct 'de'. */ |
| | 1723 | err = fill_name_de(sbi, de, &dentry->d_name, NULL); |
| | 1724 | if (err) |
| | 1725 | goto out; |
| | 1726 | |
| | 1727 | err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); |
| | 1728 | out: |
| | 1729 | __putname(de); |
| | 1730 | return err; |
| | 1731 | } |
| | 1732 | |
| | 1733 | /* |
| | 1734 | * ntfs_unlink_inode |
| | 1735 | * |
| | 1736 | * inode_operations::unlink |
| | 1737 | * inode_operations::rmdir |
| | 1738 | */ |
| | 1739 | int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) |
| | 1740 | { |
| | 1741 | int err; |
| | 1742 | struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; |
| | 1743 | struct inode *inode = d_inode(dentry); |
| | 1744 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 1745 | struct ntfs_inode *dir_ni = ntfs_i(dir); |
| | 1746 | struct NTFS_DE *de, *de2 = NULL; |
| | 1747 | int undo_remove; |
| | 1748 | |
| | 1749 | if (ntfs_is_meta_file(sbi, ni->mi.rno)) |
| | 1750 | return -EINVAL; |
| | 1751 | |
| | 1752 | /* Allocate PATH_MAX bytes. */ |
| | 1753 | de = __getname(); |
| | 1754 | if (!de) |
| | 1755 | return -ENOMEM; |
| | 1756 | |
| | 1757 | ni_lock(ni); |
| | 1758 | |
| | 1759 | if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { |
| | 1760 | err = -ENOTEMPTY; |
| | 1761 | goto out; |
| | 1762 | } |
| | 1763 | |
| | 1764 | err = fill_name_de(sbi, de, &dentry->d_name, NULL); |
| | 1765 | if (err < 0) |
| | 1766 | goto out; |
| | 1767 | |
| | 1768 | undo_remove = 0; |
| | 1769 | err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); |
| | 1770 | |
| | 1771 | if (!err) { |
| | 1772 | drop_nlink(inode); |
| | 1773 | inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); |
| | 1774 | mark_inode_dirty(dir); |
| | 1775 | inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); |
| | 1776 | if (inode->i_nlink) |
| | 1777 | mark_inode_dirty(inode); |
| | 1778 | } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { |
| | 1779 | _ntfs_bad_inode(inode); |
| | 1780 | } else { |
| | 1781 | if (ni_is_dirty(dir)) |
| | 1782 | mark_inode_dirty(dir); |
| | 1783 | if (ni_is_dirty(inode)) |
| | 1784 | mark_inode_dirty(inode); |
| | 1785 | } |
| | 1786 | |
| | 1787 | out: |
| | 1788 | ni_unlock(ni); |
| | 1789 | __putname(de); |
| | 1790 | return err; |
| | 1791 | } |
| | 1792 | |
| | 1793 | void ntfs_evict_inode(struct inode *inode) |
| | 1794 | { |
| | 1795 | truncate_inode_pages_final(&inode->i_data); |
| | 1796 | |
| | 1797 | invalidate_inode_buffers(inode); |
| | 1798 | clear_inode(inode); |
| | 1799 | |
| | 1800 | ni_clear(ntfs_i(inode)); |
| | 1801 | } |
| | 1802 | |
| | 1803 | /* |
| | 1804 | * ntfs_translate_junction |
| | 1805 | * |
| | 1806 | * Translate a Windows junction target to the Linux equivalent. |
| | 1807 | * On junctions, targets are always absolute (they include the drive |
| | 1808 | * letter). We have no way of knowing if the target is for the current |
| | 1809 | * mounted device or not so we just assume it is. |
| | 1810 | */ |
| | 1811 | static int ntfs_translate_junction(const struct super_block *sb, |
| | 1812 | const struct dentry *link_de, char *target, |
| | 1813 | int target_len, int target_max) |
| | 1814 | { |
| | 1815 | int tl_len, err = target_len; |
| | 1816 | char *link_path_buffer = NULL, *link_path; |
| | 1817 | char *translated = NULL; |
| | 1818 | char *target_start; |
| | 1819 | int copy_len; |
| | 1820 | |
| | 1821 | link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); |
| | 1822 | if (!link_path_buffer) { |
| | 1823 | err = -ENOMEM; |
| | 1824 | goto out; |
| | 1825 | } |
| | 1826 | /* Get link path, relative to mount point */ |
| | 1827 | link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); |
| | 1828 | if (IS_ERR(link_path)) { |
| | 1829 | ntfs_err(sb, "Error getting link path"); |
| | 1830 | err = -EINVAL; |
| | 1831 | goto out; |
| | 1832 | } |
| | 1833 | |
| | 1834 | translated = kmalloc(PATH_MAX, GFP_NOFS); |
| | 1835 | if (!translated) { |
| | 1836 | err = -ENOMEM; |
| | 1837 | goto out; |
| | 1838 | } |
| | 1839 | |
| | 1840 | /* Make translated path a relative path to mount point */ |
| | 1841 | strcpy(translated, "./"); |
| | 1842 | ++link_path; /* Skip leading / */ |
| | 1843 | for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { |
| | 1844 | if (*link_path == '/') { |
| | 1845 | if (PATH_MAX - tl_len < sizeof("../")) { |
| | 1846 | ntfs_err(sb, |
| | 1847 | "Link path %s has too many components", |
| | 1848 | link_path); |
| | 1849 | err = -EINVAL; |
| | 1850 | goto out; |
| | 1851 | } |
| | 1852 | strcpy(translated + tl_len, "../"); |
| | 1853 | tl_len += sizeof("../") - 1; |
| | 1854 | } |
| | 1855 | } |
| | 1856 | |
| | 1857 | /* Skip drive letter */ |
| | 1858 | target_start = target; |
| | 1859 | while (*target_start && *target_start != ':') |
| | 1860 | ++target_start; |
| | 1861 | |
| | 1862 | if (!*target_start) { |
| | 1863 | ntfs_err(sb, "Link target (%s) missing drive separator", |
| | 1864 | target); |
| | 1865 | err = -EINVAL; |
| | 1866 | goto out; |
| | 1867 | } |
| | 1868 | |
| | 1869 | /* Skip drive separator and leading /, if exists */ |
| | 1870 | target_start += 1 + (target_start[1] == '/'); |
| | 1871 | copy_len = target_len - (target_start - target); |
| | 1872 | |
| | 1873 | if (PATH_MAX - tl_len <= copy_len) { |
| | 1874 | ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", |
| | 1875 | target_start, PATH_MAX - tl_len, copy_len); |
| | 1876 | err = -EINVAL; |
| | 1877 | goto out; |
| | 1878 | } |
| | 1879 | |
| | 1880 | /* translated path has a trailing / and target_start does not */ |
| | 1881 | strcpy(translated + tl_len, target_start); |
| | 1882 | tl_len += copy_len; |
| | 1883 | if (target_max <= tl_len) { |
| | 1884 | ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", |
| | 1885 | translated, target_max, tl_len); |
| | 1886 | err = -EINVAL; |
| | 1887 | goto out; |
| | 1888 | } |
| | 1889 | strcpy(target, translated); |
| | 1890 | err = tl_len; |
| | 1891 | |
| | 1892 | out: |
| | 1893 | kfree(link_path_buffer); |
| | 1894 | kfree(translated); |
| | 1895 | return err; |
| | 1896 | } |
| | 1897 | |
| | 1898 | static noinline int ntfs_readlink_hlp(const struct dentry *link_de, |
| | 1899 | struct inode *inode, char *buffer, |
| | 1900 | int buflen) |
| | 1901 | { |
| | 1902 | int i, err = -EINVAL; |
| | 1903 | struct ntfs_inode *ni = ntfs_i(inode); |
| | 1904 | struct super_block *sb = inode->i_sb; |
| | 1905 | struct ntfs_sb_info *sbi = sb->s_fs_info; |
| | 1906 | u64 size; |
| | 1907 | u16 ulen = 0; |
| | 1908 | void *to_free = NULL; |
| | 1909 | struct REPARSE_DATA_BUFFER *rp; |
| | 1910 | const __le16 *uname; |
| | 1911 | struct ATTRIB *attr; |
| | 1912 | |
| | 1913 | /* Reparse data present. Try to parse it. */ |
| | 1914 | static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); |
| | 1915 | static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); |
| | 1916 | |
| | 1917 | *buffer = 0; |
| | 1918 | |
| | 1919 | attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); |
| | 1920 | if (!attr) |
| | 1921 | goto out; |
| | 1922 | |
| | 1923 | if (!attr->non_res) { |
| | 1924 | rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); |
| | 1925 | if (!rp) |
| | 1926 | goto out; |
| | 1927 | size = le32_to_cpu(attr->res.data_size); |
| | 1928 | } else { |
| | 1929 | size = le64_to_cpu(attr->nres.data_size); |
| | 1930 | rp = NULL; |
| | 1931 | } |
| | 1932 | |
| | 1933 | if (size > sbi->reparse.max_size || size <= sizeof(u32)) |
| | 1934 | goto out; |
| | 1935 | |
| | 1936 | if (!rp) { |
| | 1937 | rp = kmalloc(size, GFP_NOFS); |
| | 1938 | if (!rp) { |
| | 1939 | err = -ENOMEM; |
| | 1940 | goto out; |
| | 1941 | } |
| | 1942 | to_free = rp; |
| | 1943 | /* Read into temporal buffer. */ |
| | 1944 | err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); |
| | 1945 | if (err) |
| | 1946 | goto out; |
| | 1947 | } |
| | 1948 | |
| | 1949 | /* Microsoft Tag. */ |
| | 1950 | switch (rp->ReparseTag) { |
| | 1951 | case IO_REPARSE_TAG_MOUNT_POINT: |
| | 1952 | /* Mount points and junctions. */ |
| | 1953 | /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ |
| | 1954 | if (size <= offsetof(struct REPARSE_DATA_BUFFER, |
| | 1955 | MountPointReparseBuffer.PathBuffer)) |
| | 1956 | goto out; |
| | 1957 | uname = Add2Ptr(rp, |
| | 1958 | offsetof(struct REPARSE_DATA_BUFFER, |
| | 1959 | MountPointReparseBuffer.PathBuffer) + |
| | 1960 | le16_to_cpu(rp->MountPointReparseBuffer |
| | 1961 | .PrintNameOffset)); |
| | 1962 | ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); |
| | 1963 | break; |
| | 1964 | |
| | 1965 | case IO_REPARSE_TAG_SYMLINK: |
| | 1966 | /* FolderSymbolicLink */ |
| | 1967 | /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ |
| | 1968 | if (size <= offsetof(struct REPARSE_DATA_BUFFER, |
| | 1969 | SymbolicLinkReparseBuffer.PathBuffer)) |
| | 1970 | goto out; |
| | 1971 | uname = Add2Ptr( |
| | 1972 | rp, offsetof(struct REPARSE_DATA_BUFFER, |
| | 1973 | SymbolicLinkReparseBuffer.PathBuffer) + |
| | 1974 | le16_to_cpu(rp->SymbolicLinkReparseBuffer |
| | 1975 | .PrintNameOffset)); |
| | 1976 | ulen = le16_to_cpu( |
| | 1977 | rp->SymbolicLinkReparseBuffer.PrintNameLength); |
| | 1978 | break; |
| | 1979 | |
| | 1980 | case IO_REPARSE_TAG_CLOUD: |
| | 1981 | case IO_REPARSE_TAG_CLOUD_1: |
| | 1982 | case IO_REPARSE_TAG_CLOUD_2: |
| | 1983 | case IO_REPARSE_TAG_CLOUD_3: |
| | 1984 | case IO_REPARSE_TAG_CLOUD_4: |
| | 1985 | case IO_REPARSE_TAG_CLOUD_5: |
| | 1986 | case IO_REPARSE_TAG_CLOUD_6: |
| | 1987 | case IO_REPARSE_TAG_CLOUD_7: |
| | 1988 | case IO_REPARSE_TAG_CLOUD_8: |
| | 1989 | case IO_REPARSE_TAG_CLOUD_9: |
| | 1990 | case IO_REPARSE_TAG_CLOUD_A: |
| | 1991 | case IO_REPARSE_TAG_CLOUD_B: |
| | 1992 | case IO_REPARSE_TAG_CLOUD_C: |
| | 1993 | case IO_REPARSE_TAG_CLOUD_D: |
| | 1994 | case IO_REPARSE_TAG_CLOUD_E: |
| | 1995 | case IO_REPARSE_TAG_CLOUD_F: |
| | 1996 | err = sizeof("OneDrive") - 1; |
| | 1997 | if (err > buflen) |
| | 1998 | err = buflen; |
| | 1999 | memcpy(buffer, "OneDrive", err); |
| | 2000 | goto out; |
| | 2001 | |
| | 2002 | default: |
| | 2003 | if (IsReparseTagMicrosoft(rp->ReparseTag)) { |
| | 2004 | /* Unknown Microsoft Tag. */ |
| | 2005 | goto out; |
| | 2006 | } |
| | 2007 | if (!IsReparseTagNameSurrogate(rp->ReparseTag) || |
| | 2008 | size <= sizeof(struct REPARSE_POINT)) { |
| | 2009 | goto out; |
| | 2010 | } |
| | 2011 | |
| | 2012 | /* Users tag. */ |
| | 2013 | uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); |
| | 2014 | ulen = le16_to_cpu(rp->ReparseDataLength) - |
| | 2015 | sizeof(struct REPARSE_POINT); |
| | 2016 | } |
| | 2017 | |
| | 2018 | /* Convert nlen from bytes to UNICODE chars. */ |
| | 2019 | ulen >>= 1; |
| | 2020 | |
| | 2021 | /* Check that name is available. */ |
| | 2022 | if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) |
| | 2023 | goto out; |
| | 2024 | |
| | 2025 | /* If name is already zero terminated then truncate it now. */ |
| | 2026 | if (!uname[ulen - 1]) |
| | 2027 | ulen -= 1; |
| | 2028 | |
| | 2029 | err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); |
| | 2030 | |
| | 2031 | if (err < 0) |
| | 2032 | goto out; |
| | 2033 | |
| | 2034 | /* Translate Windows '\' into Linux '/'. */ |
| | 2035 | for (i = 0; i < err; i++) { |
| | 2036 | if (buffer[i] == '\\') |
| | 2037 | buffer[i] = '/'; |
| | 2038 | } |
| | 2039 | |
| | 2040 | /* Always set last zero. */ |
| | 2041 | buffer[err] = 0; |
| | 2042 | |
| | 2043 | /* If this is a junction, translate the link target. */ |
| | 2044 | if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) |
| | 2045 | err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); |
| | 2046 | |
| | 2047 | out: |
| | 2048 | kfree(to_free); |
| | 2049 | return err; |
| | 2050 | } |
| | 2051 | |
| | 2052 | static const char *ntfs_get_link(struct dentry *de, struct inode *inode, |
| | 2053 | struct delayed_call *done) |
| | 2054 | { |
| | 2055 | int err; |
| | 2056 | char *ret; |
| | 2057 | |
| | 2058 | if (!de) |
| | 2059 | return ERR_PTR(-ECHILD); |
| | 2060 | |
| | 2061 | ret = kmalloc(PAGE_SIZE, GFP_NOFS); |
| | 2062 | if (!ret) |
| | 2063 | return ERR_PTR(-ENOMEM); |
| | 2064 | |
| | 2065 | err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); |
| | 2066 | if (err < 0) { |
| | 2067 | kfree(ret); |
| | 2068 | return ERR_PTR(err); |
| | 2069 | } |
| | 2070 | |
| | 2071 | set_delayed_call(done, kfree_link, ret); |
| | 2072 | |
| | 2073 | return ret; |
| | 2074 | } |
| | 2075 | |
| | 2076 | // clang-format off |
| | 2077 | const struct inode_operations ntfs_link_inode_operations = { |
| | 2078 | .get_link = ntfs_get_link, |
| | 2079 | .setattr = ntfs3_setattr, |
| | 2080 | .listxattr = ntfs_listxattr, |
| | 2081 | }; |
| | 2082 | |
| | 2083 | const struct address_space_operations ntfs_aops = { |
| | 2084 | .read_folio = ntfs_read_folio, |
| | 2085 | .readahead = ntfs_readahead, |
| | 2086 | .writepages = ntfs_writepages, |
| | 2087 | .write_begin = ntfs_write_begin, |
| | 2088 | .write_end = ntfs_write_end, |
| | 2089 | .direct_IO = ntfs_direct_IO, |
| | 2090 | .bmap = ntfs_bmap, |
| | 2091 | .dirty_folio = block_dirty_folio, |
| | 2092 | .migrate_folio = buffer_migrate_folio, |
| | 2093 | .invalidate_folio = block_invalidate_folio, |
| | 2094 | }; |
| | 2095 | |
| | 2096 | const struct address_space_operations ntfs_aops_cmpr = { |
| | 2097 | .read_folio = ntfs_read_folio, |
| | 2098 | .readahead = ntfs_readahead, |
| | 2099 | .dirty_folio = block_dirty_folio, |
| | 2100 | }; |
| | 2101 | // clang-format on |
projects / linux-block.git / blame_incremental